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Tom Lane 19de0ab23c Fix inadequate locking during get_rel_oids(). 
get_rel_oids used to not take any relation locks at all, but that stopped
being a good idea with commit 3c3bb9933, which inserted a syscache lookup
into the function.  A concurrent DROP TABLE could now produce "cache lookup
failed", which we don't want to have happen in normal operation.  The best
solution seems to be to transiently take a lock on the relation named by
the RangeVar (which also makes the result of RangeVarGetRelid a lot less
spongy).  But we shouldn't hold the lock beyond this function, because we
don't want VACUUM to lock more than one table at a time.  (That would not
be a big problem right now, but it will become one after the pending
feature patch to allow multiple tables to be named in VACUUM.)

In passing, adjust vacuum_rel and analyze_rel to document that we don't
trust the passed RangeVar to be accurate, and allow the RangeVar to
possibly be NULL --- which it is anyway for a whole-database VACUUM,
though we accidentally didn't crash for that case.

The passed RangeVar is in fact inaccurate when dealing with a child
partition, as of v10, and it has been wrong for a whole long time in the
case of vacuum_rel() recursing to a TOAST table.  None of these things
present visible bugs up to now, because the passed RangeVar is in fact
only consulted for autovacuum logging, and in that particular context it's
always accurate because autovacuum doesn't let vacuum.c expand partitions
nor recurse to toast tables.  Still, this seems like trouble waiting to
happen, so let's nail the door at least partly shut.  (Further cleanup
is planned, in HEAD only, as part of the pending feature patch.)

Fix some sadly inaccurate/obsolete comments too.  Back-patch to v10.

Michael Paquier and Tom Lane

Discussion: https://postgr.es/m/25023.1506107590@sss.pgh.pa.us
2017-09-29 16:26:31 -04:00
config Absorb -D_USE_32BIT_TIME_T switch from Perl, if relevant. 2017-08-14 11:48:59 -04:00
contrib Add background worker type 2017-09-29 11:08:24 -04:00
doc Add background worker type 2017-09-29 11:08:24 -04:00
src Fix inadequate locking during get_rel_oids(). 2017-09-29 16:26:31 -04:00
.dir-locals.el emacs: Set indent-tabs-mode in perl-mode 2015-04-12 23:53:23 -04:00
.gitattributes Remove contrib/tsearch2. 2017-02-13 11:06:11 -05:00
.gitignore Add lcov --initial 2017-09-29 08:54:34 -04:00
aclocal.m4 Make configure check for IPC::Run when --enable-tap-tests is specified. 2017-06-15 15:56:12 -04:00
configure Avoid SIGBUS on Linux when a DSM memory request overruns tmpfs. 2017-09-25 16:09:19 -04:00
configure.in Avoid SIGBUS on Linux when a DSM memory request overruns tmpfs. 2017-09-25 16:09:19 -04:00
COPYRIGHT Update copyright for 2017 2017-01-03 12:37:53 -05:00
GNUmakefile.in Have "make coverage" recurse into contrib as well 2016-09-05 18:44:36 -03:00
HISTORY Change documentation references to PG website to use https: not http: 2017-05-20 21:50:47 -04:00
Makefile Prevent passing down MAKELEVEL/MAKEFLAGS from non-GNU make to GNU make. 2017-08-09 12:05:53 -04:00
README Change documentation references to PG website to use https: not http: 2017-05-20 21:50:47 -04:00
README.git Change documentation references to PG website to use https: not http: 2017-05-20 21:50:47 -04:00

README 

PostgreSQL Database Management System
=====================================

This directory contains the source code distribution of the PostgreSQL
database management system.

PostgreSQL is an advanced object-relational database management system
that supports an extended subset of the SQL standard, including
transactions, foreign keys, subqueries, triggers, user-defined types
and functions.  This distribution also contains C language bindings.

PostgreSQL has many language interfaces, many of which are listed here:

	https://www.postgresql.org/download

See the file INSTALL for instructions on how to build and install
PostgreSQL.  That file also lists supported operating systems and
hardware platforms and contains information regarding any other
software packages that are required to build or run the PostgreSQL
system.  Copyright and license information can be found in the
file COPYRIGHT.  A comprehensive documentation set is included in this
distribution; it can be read as described in the installation
instructions.

The latest version of this software may be obtained at
https://www.postgresql.org/download/.  For more information look at our
web site located at https://www.postgresql.org/.